Microtus ochrogaster
... Microtus ochrogaster is a crepuscular mammal. Activity occurs during sunrise and sunset, although activity changes throughout the seasons. Diurnal activity decreases during summer, and increase during the winter. Communal groups that are formed, are usually made of offspring and survivors from the ...
... Microtus ochrogaster is a crepuscular mammal. Activity occurs during sunrise and sunset, although activity changes throughout the seasons. Diurnal activity decreases during summer, and increase during the winter. Communal groups that are formed, are usually made of offspring and survivors from the ...
LIFE-HISTORY EVOLUTION IN REPTILES
... is clear that the evolutionary shift from oviparity to viviparity has taken place independently in at least 100 lineages of lizards and snakes, but never in turtles or crocodilians (Lee & Shine 1998, Shine 1985). Other cases continue to accumulate (e.g., Bauer & Sadlier 2000, Ota et al. 1991, Schult ...
... is clear that the evolutionary shift from oviparity to viviparity has taken place independently in at least 100 lineages of lizards and snakes, but never in turtles or crocodilians (Lee & Shine 1998, Shine 1985). Other cases continue to accumulate (e.g., Bauer & Sadlier 2000, Ota et al. 1991, Schult ...
GUINEA PIGS FOR MEAT PRODUCTION
... [EDITOR: I called Heifer Project's Jim DeVries (June 1990) for an update on progress in obtaining the much larger cavies that have been developed in Ecuador and Peru. Heifer has been trying to obtain them for their own distribution program for three years. They are hopeful that by 1991 they may have ...
... [EDITOR: I called Heifer Project's Jim DeVries (June 1990) for an update on progress in obtaining the much larger cavies that have been developed in Ecuador and Peru. Heifer has been trying to obtain them for their own distribution program for three years. They are hopeful that by 1991 they may have ...
Mammal Reproductive Strategies Driven by Offspring Mortality
... size. Thus, everything else being equal, natural selection favors higher birth rates and hence many small offspring (fig. 1A, 1C). Everything else is not always equal, however, and larger offspring can be adaptive if juvenile survivorship increases with offspring size (fig. 1B, 1D). Additionally, ev ...
... size. Thus, everything else being equal, natural selection favors higher birth rates and hence many small offspring (fig. 1A, 1C). Everything else is not always equal, however, and larger offspring can be adaptive if juvenile survivorship increases with offspring size (fig. 1B, 1D). Additionally, ev ...
Color and Communication in Habronattus Jumping Spiders: Tests of
... broadly divided into either sexual selection (Andersson 1994) or ecological selection (Slatkin 1984). Sexual selection drives the evolution of traits via malemale combat over access to females, such as the antlers of deer or the horns of rhinoceros beetles (reviewed in Emlen 2008), or via female cho ...
... broadly divided into either sexual selection (Andersson 1994) or ecological selection (Slatkin 1984). Sexual selection drives the evolution of traits via malemale combat over access to females, such as the antlers of deer or the horns of rhinoceros beetles (reviewed in Emlen 2008), or via female cho ...
Chapter 5 Gases
... Females protect offspring from infanticide by forcing males to compete through sperm November 13, 2014 New research shows the females of some species will have many mates to ensure unclear paternity, so that males can't resort to killing their rival's offspring for fear of killing their own. This fo ...
... Females protect offspring from infanticide by forcing males to compete through sperm November 13, 2014 New research shows the females of some species will have many mates to ensure unclear paternity, so that males can't resort to killing their rival's offspring for fear of killing their own. This fo ...
Ecology and Reproductive Characteristics of the Skink
... Japalura swinhonis, and Mabuya longicaudata also resemble those of temperate lizards (Huang 2006a b 2007). Although the reproductive biology of low-elevation subtropical lizards of Taiwan was examined (Cheng 1987), that of lizards of tropical areas such as those on Orchid I. has not been well ...
... Japalura swinhonis, and Mabuya longicaudata also resemble those of temperate lizards (Huang 2006a b 2007). Although the reproductive biology of low-elevation subtropical lizards of Taiwan was examined (Cheng 1987), that of lizards of tropical areas such as those on Orchid I. has not been well ...
PDF
... In this study, the hypothesis that season-induced time constraints explain variation in larval nutrition in A. dichotoma, and therefore influence morph determination in this species, was tested. It was predicted that eggs that were laid later in the reproductive season would (1) eclose as smaller in ...
... In this study, the hypothesis that season-induced time constraints explain variation in larval nutrition in A. dichotoma, and therefore influence morph determination in this species, was tested. It was predicted that eggs that were laid later in the reproductive season would (1) eclose as smaller in ...
The mating system of the brown bear Ursus arctos
... Dehnhard et al. 2006). Observational studies from the wild suggest that oestrus lasts for between 1 and 50 days (Craighead et al. 1995a, Ishikawa et al. 2003). Female brown bears have delayed implantation (Mano et al. 2002, Schwartz et al. 2003b). The fertilized ova remain dormant in the uterus for ...
... Dehnhard et al. 2006). Observational studies from the wild suggest that oestrus lasts for between 1 and 50 days (Craighead et al. 1995a, Ishikawa et al. 2003). Female brown bears have delayed implantation (Mano et al. 2002, Schwartz et al. 2003b). The fertilized ova remain dormant in the uterus for ...
The evolution of non-maternal caretaking among anthropoid
... abuse undoubtedly represents an important cost to mothers in many cases (Silk 1980; Maestripieri 1994), the benefits obtained via allocaretaking may outweigh these costs in certain situations. By providing relief from parental duties, non-maternal care may permit mothers to adjust their efforts to p ...
... abuse undoubtedly represents an important cost to mothers in many cases (Silk 1980; Maestripieri 1994), the benefits obtained via allocaretaking may outweigh these costs in certain situations. By providing relief from parental duties, non-maternal care may permit mothers to adjust their efforts to p ...
Sexual Size Dimorphism, Diet, and Reproduction in the Mexican
... Sex-related differences in size and body proportions have evolved in many animal groups as insects, fishes, amphibians, reptiles and birds, and efforts to understand the ecological and evolutionary significance of sexual dimorphism have focused on adaptive significance and physiological mechanisms ( ...
... Sex-related differences in size and body proportions have evolved in many animal groups as insects, fishes, amphibians, reptiles and birds, and efforts to understand the ecological and evolutionary significance of sexual dimorphism have focused on adaptive significance and physiological mechanisms ( ...
Lesson Overview - Mater Academy of International Studies
... however, often depends on its internal condition. Many behaviors are essential to survival. To survive and reproduce, animals must be able to find and catch food, select habitats, avoid predators, and find mates. Behaviors that make these activities possible are just as important as physical charact ...
... however, often depends on its internal condition. Many behaviors are essential to survival. To survive and reproduce, animals must be able to find and catch food, select habitats, avoid predators, and find mates. Behaviors that make these activities possible are just as important as physical charact ...
Slide 1
... however, often depends on its internal condition. Many behaviors are essential to survival. To survive and reproduce, animals must be able to find and catch food, select habitats, avoid predators, and find mates. Behaviors that make these activities possible are just as important as physical charact ...
... however, often depends on its internal condition. Many behaviors are essential to survival. To survive and reproduce, animals must be able to find and catch food, select habitats, avoid predators, and find mates. Behaviors that make these activities possible are just as important as physical charact ...
Growth, Survival, and Reproduction in a Northern Illinois Population
... within two weeks after birth. Scatter plots of captive-reared animals (n 5 28) versus those immediately released (n 5 22) indicated that the captive reared animals were similar in size to snakes of the same age that had been released at birth and so were included in the analyses presented here. Addi ...
... within two weeks after birth. Scatter plots of captive-reared animals (n 5 28) versus those immediately released (n 5 22) indicated that the captive reared animals were similar in size to snakes of the same age that had been released at birth and so were included in the analyses presented here. Addi ...
Ch 51 Animal Behavior student notes-wiki
... Male stickleback fish will show aggression toward any shape that has a red area. ...
... Male stickleback fish will show aggression toward any shape that has a red area. ...
insects and freshwater fish
... There are several different stick insects on Tiritiri Matangi but they are so well camouflaged that you will be lucky to see any, and the fact that they are usually only active at night makes it even more difficult. Stick insects can be brown, green or grey, and their bodies can be smooth or prickl ...
... There are several different stick insects on Tiritiri Matangi but they are so well camouflaged that you will be lucky to see any, and the fact that they are usually only active at night makes it even more difficult. Stick insects can be brown, green or grey, and their bodies can be smooth or prickl ...
September 2005 Newsletter - Transvaal Herpetological Association
... The female Colombian Boa Constrictor (Boa constrictor imperator) deemed “BCI03CFU” seems to have retained the sperm from the sire deemed “WT Male” for approximately twenty-one months. The Super Salmon Type male Colombian Boa Constrictor (Boa constrictor imperator), “SS Male”, induced ovulation in th ...
... The female Colombian Boa Constrictor (Boa constrictor imperator) deemed “BCI03CFU” seems to have retained the sperm from the sire deemed “WT Male” for approximately twenty-one months. The Super Salmon Type male Colombian Boa Constrictor (Boa constrictor imperator), “SS Male”, induced ovulation in th ...
biology - westminster.org.uk
... Puberty is the process of physical changes by which a child's body matures into an adult body capable of sexual reproduction. An investigation was carried out into the effect of the diet of pregnant female rats on the average age of onset of puberty in their female offspring. Pregnant female rats we ...
... Puberty is the process of physical changes by which a child's body matures into an adult body capable of sexual reproduction. An investigation was carried out into the effect of the diet of pregnant female rats on the average age of onset of puberty in their female offspring. Pregnant female rats we ...
Southwestern Naturalist
... Our results show that the number of centhan 1,000 individuals/ha, as in the case of Anolis limiji-onsin Panama (1,171 individuals/ha; sused adults oscillates from month to month. Sexton, 1967). However, the most common This is probably an artifact related to the visual densities fluctuate from 10 to ...
... Our results show that the number of centhan 1,000 individuals/ha, as in the case of Anolis limiji-onsin Panama (1,171 individuals/ha; sused adults oscillates from month to month. Sexton, 1967). However, the most common This is probably an artifact related to the visual densities fluctuate from 10 to ...
Crab-eating Raccoon
... SOCIAL BEHAVIOUR. It is assumed that Procyon cancrivorus has the same general behavioural patterns as members of the same genus (Chapman and Feldhamer, 1983). They are nocturnal and although they are colour blind they have good night vision. Its tactile senses set this species apart from other carni ...
... SOCIAL BEHAVIOUR. It is assumed that Procyon cancrivorus has the same general behavioural patterns as members of the same genus (Chapman and Feldhamer, 1983). They are nocturnal and although they are colour blind they have good night vision. Its tactile senses set this species apart from other carni ...
maternal behavior problems
... The mother may show inadequate retrieval of young, insufficient cleaning of the young, or failure to stimulate elimination (urination and/or defecation) by the young The bitch carries the puppies from place-to-place without settling down or, in the most extreme form, kills some or all of her lit ...
... The mother may show inadequate retrieval of young, insufficient cleaning of the young, or failure to stimulate elimination (urination and/or defecation) by the young The bitch carries the puppies from place-to-place without settling down or, in the most extreme form, kills some or all of her lit ...
Table of Contents - Milan Area Schools
... Communication • Communication is behavior that influences the actions of other individuals. • The displays or signals of communication convey information, and the transmission of this information benefits the sender and the receiver. • There are five channels of communication: chemical, visual, audi ...
... Communication • Communication is behavior that influences the actions of other individuals. • The displays or signals of communication convey information, and the transmission of this information benefits the sender and the receiver. • There are five channels of communication: chemical, visual, audi ...
A View of Life
... groups of hinds (females). Hinds only mate with one stag. Harem Master must be large and powerful to fight off challengers. Less body fat, thus may be more likely to starve in bad times, and have shorter life span. Mader: Biology 8th Ed. ...
... groups of hinds (females). Hinds only mate with one stag. Harem Master must be large and powerful to fight off challengers. Less body fat, thus may be more likely to starve in bad times, and have shorter life span. Mader: Biology 8th Ed. ...
maternal_behavior_problems
... • The bitch that is carrying her puppies or exhibiting redirected aggression to them should be isolated in a quiet, dark area • The bitch that bites her puppies should be muzzled; the owner must stimulate elimination (urination and/or defecation) of the puppies, because the muzzled female cannot do ...
... • The bitch that is carrying her puppies or exhibiting redirected aggression to them should be isolated in a quiet, dark area • The bitch that bites her puppies should be muzzled; the owner must stimulate elimination (urination and/or defecation) of the puppies, because the muzzled female cannot do ...
Butterflies~RF6c1e29.TMP
... A male butterfly has several methods of determining whether he has found a female of his own species. One way is by sight. The male will look for butterflies with wings that are the correct colour and pattern. When a male sights a potential mate it will fly closer, often behind or above the female ...
... A male butterfly has several methods of determining whether he has found a female of his own species. One way is by sight. The male will look for butterflies with wings that are the correct colour and pattern. When a male sights a potential mate it will fly closer, often behind or above the female ...